After your 21st birthday, it’s really the round numbers that people seem to care about. They make a big deal out of turning 30 — to be honest, it was my 31st that made me feel significantly older — and you’re “over the hill” at 40. I remember my father having a big birthday party when he turned 50, and I’m pretty sure my mother will still deny that her 60th ever happened.

But turning 42? That birthday seems significant for only one man.

Mariano Rivera, No. 42 himself, turned 42 today. The game’s greatest closer is in the second year of a two-year deal, and there is already talk that next season might be his last. My guess is Mo will keep throwing those cutters as long as they’re effective.

Happy birthday Mo, and here are a few notes and links from another quiet Tuesday.

• Not really a note, but I had a conversation with another Yankees writer this afternoon. The topic of discussion: There is nothing going on with this team!

• A quick note on an earlier item from today: When Curtis Granderson opened that playground in the Bronx on Monday, for every home run he hit, the American Dairy Association & Dairy Council agreed to donate $100 to PS19X for school nutrition programs. Curtis actually hit seven, but the ADADC donated a total of $1,500 in honor of his visit.